<!DOCTYPE html>
<html>
      <head>
            <meta charset="utf-8">
            <meta name="viewport" content="width=device-width,initial-scale=1">
            <title>轮播图</title>
            <link rel="stylesheet" href="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
            <script src="https://cdn.staticfile.net/jquery/3.2.1/jquery.min.js"></script>
            <script src="https://cdn.staticfile.net/popper.js/1.15.0/umd/popper.min.js"></script>
            <script src="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
      </head>
      <body>
            <div class="container">
                  <div id="demo" class="carousel slide" data-ride="carousel">
                        <!-- 指示符 -->
                        <ul class="carousel-indicators">
                              <li data-target="#demo" data-slide-to="0" class="active"></li>
                              <li data-target="#demo" data-slide-to="1"></li>
                              <li data-target="#demo" data-slide-to="2"></li>
                        </ul>
                        <!-- 轮播图片 -->
                        <div class="carousel-inner">
                              <div class="carousel-item active">
                                    <img src="https://img1.baidu.com/it/u=328002743,1511633109&fm=253&fmt=auto&app=138&f=JPEG?w=751&h=500" alt="图片1" style="width: 100%;height: 600px;">
                                    <div class="carousel-caption">
                                          <h3>第一张图片描述标题</h3>
                                          <p>描述文字！</p>
                                    </div>
                              </div>
                              <div class="carousel-item">
                                    <img src="https://pic.quanjing.com/3n/lx/QJ6675188200.jpg@%21794ws" alt="图片2" style="width: 100%;height: 600px;">
                                    <div class="carousel-caption">
                                          <h3>第二张图片描述标题</h3>
                                          <p>描述文字！</p>
                                    </div>
                              </div>
                              <div class="carousel-item">
                                    <img src="https://img0.baidu.com/it/u=1238480556,3935301072&fm=253&fmt=auto&app=138&f=JPEG?w=1067&h=800" alt="图片3" style="width: 100%;height: 600px;">
                                    <div class="carousel-caption">
                                          <h3>第三张图片描述标题</h3>
                                          <p>描述文字！</p>
                                    </div>
                              </div>
                        </div>
                        <!-- 左右切换按钮 -->
                        <a class="carousel-control-prev" href="#demo" data-slide="prev">
                              <span class="carousel-control-prev-icon"></span>
                        </a>
                        <a class="carousel-control-next" href="#demo" data-slide="next">
                              <span class="carousel-control-next-icon"></span>
                        </a>
                  </div>
            </div>
      </body>
</html>